Under　depressurization,　the　hydrate　reservoirs　undergo　complex　mechanical　behaviors　such　as　consolidation　or　shear.　To　deeply　understand　the　evolution　in　the　mechanical　properties　of　soil,　triaxial　equipment　with　an　ultrasonic　system　was　used　to　detect　the　shear　wave　velocity　in　hydrate-bearing　sediments.　The　effects　of　hydrate　saturation,　water,　and　stress　state　on　shear-wave　velocity　are　studied.　The　experimental　results　show　that:　The　hydrate　saturation　significantly　affects　the　wave　velocity　in　the　hydrate　formation　stage,　while　the　water　content　has　little　influence　on　it.　During　the　consolidation　period,　the　notable　increase　in　shear　wave　velocity　indicates　a　decrease　in　soil　void　ratio,　which　means　the　soil　has　significant　settlement　deformation.　With　continuous　shearing,　the　soil　elastic　modulus　is　damaged,　and　finally,　the　maximum　damage　can　reach　35%.　The　conclusions　can　deepen　understanding　of　the　physical　and　mechanical　properties　of　hydrate-bearing　sediments　in　permafrost,　and　provide　a　reference　for　predicting　the　stratum　stability　during　hydrate　exploitation.　©　2023